I tried Gears of War... Didn't like the control scheme at ALL, the camera felt awkward and I felt I spent more time fighting that than using the Hammer of Dawn on poor unsuspecting evil.... things. I like the graphics though.
I never got into Oblivion.... may consider that my next gaming purchase.
GH3: I still can't finish Raining Blood on Hard. Expert?! LOL I laugh... because it's impossible. One day I'll go back and blow through medium to get Through the Fire and Flames..... too bad the first and second sets suck soooooo much.
Still gotta finish CoD4 before I start a massive single player game like Oblivion though. Because it's just THAT BIG.